package com.bdqn.t382.sz;

import java.lang.reflect.InvocationHandler;

import java.lang.reflect.Method;
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class LoggingInvocationHandler implements InvocationHandler {
private final Object target;

     public LoggingInvocationHandler(Object target) {
      this.target = target;
      }

      @Override
 public Object invoke(Object proxy, Method method, Object[] args)
 throws Throwable {
     // 获取实现类中的方法信息
     Method methodTarget = target.getClass().getMethod(method.getName());
     // 判断方法上面是否有 Log 注解
     if (methodTarget.isAnnotationPresent(Log.class)) {
      String methodName = method.getName();
      DateTimeFormatter formatter = DateTimeFormatter
      .ofPattern("yyyy-MM-dd HH:mm:ss.SSS");
      LocalDateTime startTime = LocalDateTime.now();

      System.out.println("[LOG] Method: " + methodName + " started at: "
      + startTime.format(formatter));

      Object result = method.invoke(target, args);
      LocalDateTime endTime = LocalDateTime.now();
      long duration = java.time.Duration.between(startTime,
           endTime).toMillis();

      System.out.println("[LOG] Method: " + methodName + " ended at: "
      + endTime.format(formatter));
      System.out.println("[LOG] Method: " + methodName
      + " executed in: " + duration + "ms");
      return result;
      } else {
      return method.invoke(target, args);
      }
     }
}
